<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    
</body>
<script>
    //递归

    var arr =[["ahgd"],"ahd","ahsdf"]


    function fileNumber(dir){
        var num=0;
        dir.forEach(function(o) {
            if((typeof o)=="string"){
                num++
            }else{
                num+=fileNumber(o);
            }
        });
        return num;
    }
    console.log (fileNumber(arr))
</script>
</html>